Convert BMP to ICO Online
BMP is Microsoft's uncompressed bitmap format, while ICO is the Windows icon container format. This online converter turns your BMP files into ICO without installing software. The ICO output gains an alpha channel, so you can add transparent backgrounds in later edits.
Conversion route
BMP → ICO
Output Settings
Icon sizes to include
One ICO file will contain all selected sizes. Default: 16, 32, 48, 256 px.
About BMP to ICO Conversion
This free online converter transforms BMP images into ICO format directly in your browser. BMP is the uncompressed bitmap format from Microsoft, while ICO is the Windows icon container format. Whether you need broader compatibility, smaller file sizes, or different editing capabilities, switching from BMP to ICO takes just a few seconds and requires no software installation.
The ICO output gains an alpha channel that the original BMP lacked, giving you the freedom to add transparent backgrounds in later edits without starting your work over from scratch. The ICO output is lossless, preserving your image as faithfully as the format allows without introducing any new compression artifacts of its own. The ICO output bundles several sizes into one file, with sensible defaults that cover most favicon and icon needs.
This conversion is popular with people who work with legacy Windows applications and low-level image processing, as well as anyone preparing images for Windows application icons and website favicons. BMP files are huge because they store uncompressed pixel data, so moving to ICO is a sensible, practical step. The result is a clean file that is ready to share, upload, publish, or edit further in your favorite tools.
Your privacy is protected throughout the entire process. Conversion happens entirely inside your browser, so your files never leave your device and are never uploaded to any server. The tool is completely free, handles multiple files at once, and works on any device with a modern browser, making it simple to convert BMP to ICO whenever you need to.
How to Convert BMP to ICO
- 1
Upload your BMP file by dragging it into the box or clicking to browse. You can add multiple files at once.
- 2
Select the icon sizes to include (16, 32, 48, 64, 128, 256). The defaults cover most favicon needs.
- 3
Click Convert. Your BMP is converted right inside your browser.
- 4
Download your new ICO file when processing finishes.
Why Use This Converter
Simple conversion
Convert BMP to ICO with no software installation.
Private by design
Your files are converted entirely inside your browser and never leave your device.
Faithful output
ICO output keeps the source content as faithfully as the target format allows.
Transparency preserved
Alpha channels are kept intact in the converted file.
Frequently Asked Questions
Do I need to install software to convert BMP to ICO?
No. The conversion runs through the web interface and the result is available as a download.
How is my BMP file processed?
This direction converts your file entirely inside your browser. The file never leaves your device and is not uploaded to any server.
What's the maximum BMP file size?
You can upload files up to 50 MB for this direction.